Die body, system and method for measuring oscillation of gantry of CT (computed tomography) device
A phantom and equipment technology, applied in the field of medical imaging, to achieve the effect of improving image quality
Active Publication Date: 2015-04-29
SIEMENS SHANGHAI MEDICAL EQUIP LTD
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Problems solved by technology
However, in the prior art, there is a lack of equipment and methods for accurate and quantitative measurement of rack swing
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[0045] In order to make the purpose, technical solution and advantages of the present invention clearer, the following examples are given to further describe the present invention in detail.
[0046] In the present invention, it is defined that the horizontal direction of the inspection bed in and out of the frame in the CT equipment is the z-axis direction, the vertical direction of the inspection bed is the y-axis direction, and the y-axis direction is perpendicular to the z-axis direction, while it is perpendicular to the y-axis direction and the z-axis direction. The direction in which the axis directions are all orthogonal is the x-axis direction. Normally, the rack can be rotated in an x-y plane to scan the image without tilting, and the swing of the rack is the deviation from the x-y plane in the z-axis direction, which can be understood as the plane of the rack in terms of numerical quantification The degree of inclination to the x-y plane.
[0047] I: Phantom Desig...
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The invention relates to a die body for measuring oscillation of a gantry of a CT (computed tomography) device. The die body comprises a first part and a second part, wherein the first part is shaped in a cuboid, aluminum tapes are obliquely embedded in the upper area and the lower area of the first part, and no aluminum tape is embedded in the middle area of the first part, and an angle formed between one aluminum tape and a plane formed along the length direction and the width direction of the first part is identical with an angle formed between the other aluminum tape and the plane of the first part in absolute value and is opposite to the same in positive-negative direction. The second part is a cylinder capable of driving the first part to rotate and holding the first part. Besides, the invention further relates to a system and a method for measuring oscillation of the gantry of the CT device. By the aid of the die body, the system and the method, oscillation of the gantry of the CT device can be accurately measured, accurate foundation can be provided to operators to adjust hardware of the CT device and to software algorithm utilized in radiation scanning of the CT device, and accordingly image quality of a reconstructed image is improved.
Description
technical field [0001] The invention relates to the field of medical imaging, in particular to a phantom, system and method for measuring the swing of a frame of an X-ray computed tomography equipment. Background technique [0002] During X-ray computed tomography (Computed Tomography, CT) scanning, a gantry (gantry) of the CT equipment rotates to perform X-ray scanning on an object to be inspected. Due to the high-speed rotation, the gantry will undesirably wobble in the direction in which the examination table enters and exits the gantry during the rotation process, and this wobble will degrade the image quality of the reconstructed image. With the continuous improvement of the time resolution requirements, the rotation speed of the rack is also required to increase, which will significantly increase the centripetal torque of the rack, resulting in a larger swing of the rack. [0003] If you want to obtain high-quality reconstructed images when the gantry rotates at a hig...
Claims
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IPC IPC(8): G01B21/22
Inventor 张纪庄王薇郭华伟
Owner SIEMENS SHANGHAI MEDICAL EQUIP LTD